RES retains second place in Wood Mackenzie’s 2026 solar O&M rankings, backed by world’s largest GWO-certified solar workforce 

The result reinforces RES’ position as the independent service provider with the widest geographical reach in solar operations and maintenance – backed by the world’s largest internationally certified GWO solar workforce. 

London, UK – 1 September 2026 – Wood Mackenzie has ranked RES second in its annual global solar operations and maintenance (O&M) service provider rankings for 2026, maintaining the position held since 2024. The result reflects RES’ continued expansion in solar O&M services, where it now manages 24,3 GW of operational solar assets across multiple markets worldwide. 

RES operates as the independent service provider with the widest geographical reach in the solar O&M sector, supporting assets across Europe, the Americas and Asia-Pacific. The company has developed and constructed 4.5GW of solar capacity globally, and its service offer spans the full operational lifecycle of solar installations – from asset management and performance optimisation through to corrective and preventive maintenance. 

The ranking coincides with a significant milestone in solar workforce development. RES has built the world’s largest internationally certified GWO solar workforce, with technicians trained to Global Wind Organisation (GWO) standards – a benchmark previously most associated with the offshore wind sector – now applied at scale to solar O&M. The achievement reflects RES’ long-term commitment to raising the standards of safety, professionalisation and skills that will define the next phase of the global solar industry. 

GWO certification provides clients and asset owners with confidence that RES technicians meet a rigorous, internationally recognised competency standard. RES operates training centres for technicians in Europe and Latin America, and its growing solar certified cohort is the largest of its kind globally. As solar O&M capacity scales rapidly to meet net zero targets, RES believes that certified, professional workforces are foundational to delivering safe, reliable, long-term asset performance. 

Juan Gutierrez, CEO of RES Services, said: “Retaining second place in Wood Mackenzie’s global solar O&M rankings for consecutive years is a reflection of what our teams deliver every day across 24,3 GW of solar assets and multiple continents. What we’ve built in solar goes beyond scale – it’s about the quality and capability of the people behind it. Achieving GWO certification for the world’s largest solar O&M workforce is our commitment in action: to the clients who trust us with their assets, and to the industry standard we believe the solar sector deserves.” 

ENDS 

Notes to editors 

•  Wood Mackenzie’s annual solar O&M service provider rankings evaluate independent service providers on managed capacity, geographical reach, service breadth and market presence. RES has held second place for consecutive years. 

•  RES provides operational services to more than 10GW of solar assets globally, across Europe, the Americas and Asia-Pacific. 

•  GWO (Global Wind Organisation) sets internationally recognised safety and competency training standards for the renewables sector. RES is GWO-registered and operates training centres in Europe and Latin America. RES’ GWO-certified solar workforce is the largest of its kind in the world. 

•  Full details of RES’ GWO solar workforce milestone: https://www.res-group.com/resources/news/res-builds-worlds-largest-internationally-certified-gwo-solar-workforce/ 

•  The Wood Mackenzie ‘global solar PV O&M service provider dynamics 2026’ report is available to subscribers of their Lens Power and Renewables platform. For more info visit: https://www.woodmac.com/lens/power-and-renewables/ 

About RES 

RES is the world’s largest independent renewable energy company, working across 24 countries and active in wind, solar, energy storage, green hydrogen, transmission, and distribution. An industry innovator for over 40 years, RES has delivered more than 29GW of renewable energy projects across the globe and plans to bring more than 26GW of new capacity online in the next five years. 

As a service provider, RES has the skills and experience in asset management, operations and maintenance (O&M), and spare parts – supporting 45GW of renewable assets. RES brings to the market a range of purposeful, practical technology-based products and digital solutions designed to maximise investment and deployment of renewable energy. 

RES is the power behind a clean energy future where everyone has access to affordable zero carbon energy bringing together global experience, passion, and the innovation of its 4,500 people to transform the way energy is generated, stored and supplied. Visit: www.res-group.com 

CONTACT FOR MORE INFORMATION 

Marcus Dunér 
RES Press Office 
+46 723 762829 
[email protected]